Add /usr/local/lib/heat to default plugin_dirs
Add /usr/local/lib/heat to default plugin_dirs

Change-Id: I9750a224ee50ea38606d86a61ba7101b5265dc9e

noironetworks/heat,maestro-hybrid-cloud/heat,pratikmallya/heat,pratikmallya/heat,cwolferh/heat-scratch,takeshineshiro/heat,dragorosson/heat,cryptickp/heat,maestro-hybrid-cloud/heat,cwolferh/heat-scratch,rh-s/heat,pshchelo/heat,gonzolino/heat,pshchelo/heat,steveb/heat,dims/heat,openstack/heat,takeshineshiro/heat,steveb/heat,dims/heat,rdo-management/heat,miguelgrinberg/heat,gonzolino/heat,openstack/heat,jasondunsmore/heat,jasondunsmore/heat,srznew/heat,dragorosson/heat,miguelgrinberg/heat,noironetworks/heat,srznew/heat,rh-s/heat,cryptickp/heat,rdo-management/heat